package com.yong.service;

import com.alibaba.fastjson.JSON;
import com.yong.pojo.Content;
import com.yong.utils.HtmlParseUtil;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.TermQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

@Service
public class ContentService {
    @Autowired
    private RestHighLevelClient restHighLevelClient;
    @Autowired
    private HtmlParseUtil htmlParseUtil;

    // 1、解析数据放入 es 索引中
    public Boolean parseContent(String keyword) throws Exception {
        List<Content> contents = htmlParseUtil.parseJD(keyword);
        // 批量放入es中
        BulkRequest bulkRequest = new BulkRequest();
        bulkRequest.timeout("60s");
        for (int i = 0; i < contents.size(); i++) {
            bulkRequest.add(new IndexRequest("jd_goods")
                    .source(JSON.toJSONString(contents.get(i)), XContentType.JSON));
        }
        BulkResponse bulk = restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);
        return !bulk.hasFailures();
    }

    // 2、获取这些数据
    public List<Map<String, Object>> searchPage(String keyword, int pageNo, int pageSize) throws IOException {
        if (pageNo <= 1) pageNo = 1;

        // 条件查询
        SearchRequest request = new SearchRequest("jd_goods");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        // 分页
        sourceBuilder.from(pageNo);
        sourceBuilder.size(pageSize);

        // 靳准匹配
        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", keyword);
        sourceBuilder.query(termQueryBuilder);
        sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));

        // 执行搜索
        request.source(sourceBuilder);
        SearchResponse search = restHighLevelClient.search(request, RequestOptions.DEFAULT);

        // 解析结果
        ArrayList<Map<String, Object>> list = new ArrayList<>();
        for (SearchHit hit : search.getHits().getHits()) {
            list.add(hit.getSourceAsMap());
        }
        return list;
    }


    // 3、获取这些数据
    public List<Map<String, Object>> searchHighLightPage(String keyword, int pageNo, int pageSize) throws IOException {
        if (pageNo <= 1) pageNo = 1;

        // 条件查询
        SearchRequest request = new SearchRequest("jd_goods");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        // 分页
        sourceBuilder.from(pageNo);
        sourceBuilder.size(pageSize);

        // 精准匹配
        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", keyword);
        sourceBuilder.query(termQueryBuilder);
        sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));

        // 高亮展示
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        highlightBuilder.field("title");
        highlightBuilder.requireFieldMatch(false);
        highlightBuilder.preTags("<span style='color:red'>");
        highlightBuilder.postTags("</span>");
        sourceBuilder.highlighter(highlightBuilder);

        // 执行搜索
        request.source(sourceBuilder);
        SearchResponse search = restHighLevelClient.search(request, RequestOptions.DEFAULT);

        // 解析结果
        ArrayList<Map<String, Object>> list = new ArrayList<>();
        for (SearchHit hit : search.getHits().getHits()) {

            // 解析高亮字段
            Map<String, HighlightField> highlightFields = hit.getHighlightFields();
            HighlightField title = highlightFields.get("title"); // 高亮的字段
            Map<String, Object> sourceAsMap = hit.getSourceAsMap(); // 原来的结果
            if (title != null) {
                Text[] fragments = title.fragments();
                String n_title = "";
                for (Text fragment : fragments) {
                    n_title += fragment;
                }
                sourceAsMap.put("title", n_title);
            }

            list.add(sourceAsMap);
        }
        return list;
    }
}
